On Thursday, September 5, 2013 7:31:04 AM UTC+2, Jean-Michel FAYARD wrote:
> I want to be able to rename as freely as possible the filenames that are 
> on my github 
> repository<https://github.com/internaciulo/jean-michel.bertrou.eu>
> The thing is that I don't want to have ugly broken links on my future 
> website.
> There should be a javascript redirection from each link that used to work 
> fine to the actual version of it
> I think it will be quite easy to hack jekyll in order to have those 
> necessarry redirections
> But for this, I need to have a `REDIRECTIONS` textfile that will be 
> automatically updated each time a commit changes to my git repository
>    1. I have learned that pre- and post-commit hooks exist but I don't 
>    know yet how they work
You can read more about them in the docs, but I don't think you'll find 
what you're looking for in the post-commit hook, because you can't change a 
commit during a hook.

One strategy a lot of people apply in this situation is to use the git 
pre-commit hook as an early warning system for something you forgot to do. 
In your situation you could write a hook that inspects the incoming commit, 
parses together a list of renamed files, and then checks if they are listed 
in REDIRECTIONS. If not, print an error and return non-zero. This will 
prevent you from committing if you have forgotten to update REDIRECTIONS.

Now, maybe you could make a little helper script that uses Git to make 
changes to REDIRECTIONS for you, but I doubt it's that much work to do 
manually anyway.

>    1. More importantly, I need your help to know how I can parse a git 
>    commit in order to have a list of newly "renamed" files
> I say "renamed" files because I have leraned that for git, there is not 
> really such thing as a rename operation
> At first it confused me, but then I understood that Linus, who is much 
> smarter than me ;-), had good reasons to do that

Even though renames aren't explicitly stored in Git, they can be detected, 
and git log will detect renames by default. You can further tweak rename 
detection, as it is a bit of a science if you want to get more into it, 
have a look at the git log 
docs<https://www.kernel.org/pub/software/scm/git/docs/git-log.html>if you want 
to do so. 

But still, for my static website generator, I *do* need to know which files 
> were renamed since the last commit (a broken url is a broken url)
> that is, which files git detected as similar enough so that we can safely 
> assume it was a rename operation

To see local changes in Git, you use `git status`. In contrast from git 
log, status will not detect renames immediately. You have to stage the 
changes with `git add -A` (short explanation: before staging, the changes 
are not in Git's database, and before that Git can't do anything 
intelligent with rename detection).


➜  ~/prefs/[master]>mv README.md foo.md
➜  ~/prefs/[master]✗>git status -s
?? foo.md
➜  ~/prefs/[master]✗>git add -A
➜  ~/prefs/[master]✗>git status -s
R  README.md -> foo.md

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